Open paste (6)
I believe the answer is:
spread
I believe this clue is a double definition.
'open' is the first definition.
(I know that open can be written as spread)
'paste' is the second definition.
(I know that paste can be written as spread)
(Other definitions for spread that I've seen before include "Scatter or distribute more thinly" , "butter?" , "Scatter around" , "Distributed over" , "Expanse; edible paste" .)